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With Acrobat, documents can be digitally signed A digital signature is like an electronic thumbprint; it identifies the signer of the document It also records any changes made by the signer and stores information about the signer with the document When you add Acrobat Certificate Security to a document, only a team member with an authorized digital signature can view the document Acrobat users with digital signatures can select their digital ID and log in prior to working on secure documents Secure documents will open without requesting the user for a password if an authorized user has selected his or her digital ID and logged in prior to opening the document
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Add Digital Signatures and Document Security
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If you use Acrobat to send contracts to clients, digital signatures can be used to approve contracts If both parties accept a digital signature as an electronic facsimile of a handwritten signature, a digitally signed contract may be legally binding Before you accept a digital signature as legally binding authorization to proceed with a contract, it is best to seek the advice of legal counsel Figure 11-1 shows a document that has been digitally signed
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Use Digital Signatures
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When you decide to use digital signatures to verify the identities of users modifying your documents, you can use the default Acrobat Certificate Security, use the Adobe Policy Server, or specify a third-party service to handle digital signatures After you decide on a signature handler, you need to create a digital ID Your digital ID stores information about you You can use the default Acrobat graphic for a digital signature or customize the digital signature with a photo or other graphic, such as a logo When you work with colleagues with whom you will exchange secure documents, you can create a list of trusted identities Trusted identities are digital signature certificates, which are files in FDF, P7C, P7B, CER, or APF format that are used to verify digital signatures You can request digital IDs of colleagues via e-mail and share your certificate with other colleagues so that your digital signature can be verified Documents can be signed multiple times by multiple authors Whenever a document is digitally signed, Acrobat records the changes made since the document was last digitally signed When you open a document with multiple signatures, you view the most current version of the document You can view earlier versions of a digitally signed document and compare different versions When you compare different versions of a document, you can also view the changes made by each signer
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FIGURE 11-1
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A digital signature can be legally binding
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You can create a digital ID from within Acrobat and send your certificate to other parties in order to verify your signature If you intend to distribute the document widely, this can be tedious You can, however, secure a digital ID from a trusted Adobe party, which will enable any user of Adobe Reader 70, Acrobat Standard, or Acrobat Professional to verify the document
Create a User Profile
You create a user profile to create identification and a password that links to your digital signature You can create more than one user profile if you sign documents in different capacities To create your first user profile, follow these steps: 1 Choose Advanced | Security Settings to open the Security Settings dialog box
2 Click the Add ID button to open the Add Digital ID wizard On the first page select one of the options: Find An Existing Digital ID, Create A Self-Signed Digital ID, or Get A Third Party Digital ID (which may require an Internet connection) Click Next The following steps assume that you have selected Create A Self-Signed Digital ID If you choose to set up a third-party ID, you are directed to Adobe s web site, where you follow the prompts to set up a third-party ID If you already have an existing digital ID, such as a Windows certificate, on your computer, click the Find An Existing Digital ID radio button and click Next The next wizard page prompts you to locate the ID file and enter your password After following these steps, you can use the digital ID from within Acrobat to certify documents and apply security settings 3 The second Add Digital ID wizard page advises you that people wishing to validate your digital ID must contact you directly, and that creating a digital ID in this manner may not be appropriate for third-party validation Click Next after you have read the information 4 On the next page of the wizard, choose one of the following options to specify where you would like to store your Self-Signed Digital ID:
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